Its been bothering me for some time now, When building your own box one would use terminal cups. Now say your running 4ga wire to them Whould you just get a 4ga spade terminal and screw it into its corresponding pin? Also on the other side of the cup (* the one in your box *) what ga wire should you use? after google'ing it i found some pictures and it looks like the person was useing 12ga(ish) wire. it just seems weird After useing such big wire to downgrade to the small wire.

Any thoughts?

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use the same size on both ends, though most people i know dont use cups they just drill a hole for the wire to go through then seal it up from inside.